fix(curriculum): add isHidden: false to challenges

This includes certificates (where it does nothing), but does not
include any translations.

curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/access-the-json-data-from-an-api.english.md

@@ -2,6 +2,7 @@
 id: 587d7fae367417b2b2512be4
 title: Access the JSON Data from an API
 challengeType: 6
+isHidden: false
 forumTopicId: 301499
 ---
 

curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/change-text-with-click-events.english.md

@@ -2,6 +2,7 @@
 id: 587d7fad367417b2b2512be2
 title: Change Text with click Events
 challengeType: 6
+isHidden: false
 forumTopicId: 301500
 ---
 

curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/convert-json-data-to-html.english.md

@@ -2,6 +2,7 @@
 id: 587d7fae367417b2b2512be5
 title: Convert JSON Data to HTML
 challengeType: 6
+isHidden: false
 forumTopicId: 16807
 ---
 

curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/get-geolocation-data-to-find-a-users-gps-coordinates.english.md

@@ -2,6 +2,7 @@
 id: 587d7faf367417b2b2512be8
 title: Get Geolocation Data to Find A User's GPS Coordinates
 challengeType: 6
+isHidden: false
 forumTopicId: 18188
 ---
 

curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/get-json-with-the-javascript-fetch-method.english.md

@@ -2,6 +2,7 @@
 id: 5ccfad82bb2dc6c965a848e5
 title: Get JSON with the JavaScript fetch method
 challengeType: 6
+isHidden: false
 forumTopicId: 301501
 ---
 

curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/get-json-with-the-javascript-xmlhttprequest-method.english.md

@@ -2,6 +2,7 @@
 id: 587d7fae367417b2b2512be3
 title: Get JSON with the JavaScript XMLHttpRequest Method
 challengeType: 6
+isHidden: false
 forumTopicId: 301502
 ---
 

curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/handle-click-events-with-javascript-using-the-onclick-property.english.md

@@ -2,6 +2,7 @@
 id: 587d7fad367417b2b2512be1
 title: Handle Click Events with JavaScript using the onclick property
 challengeType: 6
+isHidden: false
 forumTopicId: 301503
 ---
 

curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/post-data-with-the-javascript-xmlhttprequest-method.english.md

@@ -2,6 +2,7 @@
 id: 587d7faf367417b2b2512be9
 title: Post Data with the JavaScript XMLHttpRequest Method
 challengeType: 6
+isHidden: false
 forumTopicId: 301504
 ---
 

curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/pre-filter-json-to-get-the-data-you-need.english.md

@@ -2,6 +2,7 @@
 id: 587d7fae367417b2b2512be7
 title: Pre-filter JSON to Get the Data You Need
 challengeType: 6
+isHidden: false
 forumTopicId: 18257
 ---
 

curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/render-images-from-data-sources.english.md

@@ -2,6 +2,7 @@
 id: 587d7fae367417b2b2512be6
 title: Render Images from Data Sources
 challengeType: 6
+isHidden: false
 forumTopicId: 18265
 ---